Turbofan engine having a counterrotating partially geared fan dr

Details Turbofan engine having a counterrotating partially geared fan dr Turbofan engine having a counterrotating partially geared fan dr

1989-01-03

1990-11-13

Stout, Donald E.

Power plants

Reaction motor

Interrelated reaction motors

60268, 60 39162, 416129, F02C 367, F02C 736, F02K 372

Patent

active

049693255

ABSTRACT:
A high bypass ratio turbofan engine having a fan section, a booster compressor disposed aft of the fan section relative to the flow of combustion gases through the engine, and a core section disposed aft of the booster compressor. A low pressure counterrotating turbine, disposed aft of the core section, is used for driving the fan section and the booster compressor. The counterrotating turbine includes at least one set of rotating turbine blades and at least one set of oppositely rotating counterrotating turbine blades. A twin spool shaft is provided for coupling the turbine blades to the booster compressor and for coupling the counterrotating turbine blades to the fan section. A reduction gear is disposed in the drive shaft for coupling the turbine blades to the fan section and for reducing the rotational speed of the turbine output power to match the rotational speed of the fan section thereby splitting the usable work of the turbine blades between the fan section and the booster.

REFERENCES:
patent: 3673802 (1972-07-01), Krebs et al.
patent: 3729957 (1973-05-01), Petrie et al.
patent: 4005575 (1977-02-01), Scott et al.
patent: 4159624 (1979-07-01), Gruner
patent: 4251987 (1981-02-01), Adamson

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